Improvement in electric blasting-fuses



0. A. 8: I. S.'BROWNE. ELECTRIC BLASTING FUSE.

No. 108,324. iate-nted Oct. 18,1870.

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GHARLES A. BROWNE AND rsAAo s. BROWNE, or NORTH ADAMS, MAS: SAOHUSETTS.

Letters Patent N0. 108,324, dated October 18, 1870.

The Schedule referred to in these Letters Patent and making part of thelsame.

To all whom it may concern Be it known that we OHAnnEs A; Bnowun and ISAAC -S. BROWNE, of North .Adams, in the county of Berkshire and State of Massachusetts, have invented a new and improved Electric Fuse; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, refer- ;ence being had-to the accompanying drawing form ing part of this specification.

Figure 1 is a longitudinal section of our improved fuse, and

fi Figure 2 is a transverse section on the line x a; of

Similar letters of reference indicate corresponding parts.

Electric fuses of this class are usually divided into so principal parts, first, the main wires; second, the cap, or that part which contains the explosive matena When these two parts are properly joined-they constitute an electric fuse. I

The cap of this fuse consists of two pieces: first, a primer, 0; second, a cap, E, into which the primer C is introduced, the two forming a complete electric cap.

The-primer 0 is made of wood, or other non-couductingmaterial, having a chamber, D, at one end, for the reception of any material easily exploded by electiicity.

' Around and just above the {bottomof the, chamber -D, in,the primer 0, and upon the surface of the primer 0, there is turned a groove, G, into which the wires BB are placed, communicating with the chamber D in the primer 0.

The cap F, or second piece, is also made of wood or other non-conducting material, and is provided with holes through its sides, through which the main wires A A pass.

This cap F also contains, in its chamber E, a'ny explosi-ve material which may be ignited by the explosive in the chamber- D o? the primer C.

When each of the above parts is charged with the proper explosive, and the main wires A A are passed through the holes in the cap, and the primer 0 is introduced into the chamber E of said cap F, metallic communication is made between each of the wires B B in the primer C, and each of the main wires A A, the whole forming a complete electric fuse.

Having thus described our invention,

We claim as new and desire to secure by Letters Patent An electric fuse, formed of a primer provided with wires or metallic bands, arranged in an outer groove, and of a charged cap, through the sides of which the main wires of a battery are inserted, the primer and cap being fitted together, as shown and described, whereby metallic communication is made between their respective wires, substantially as and for the purpose specified.

CHARLES A. BROWNE. ISAAC 'S. BROWNE.

\Vitnesses:

WALLACE FREEMAN, 0. W. VAN DEMARK. 

